The sensitive detection and quantitation of antibody to HCV by using a microsphere-based immunoassay and flow...

Area of Science:

• Immunology
• Virology
• Biotechnology

Background:

• Hepatitis C virus (HCV) infection diagnosis relies on antibody detection.
• Accurate and sensitive assays are crucial for early and reliable diagnosis.
• Current methods may face limitations in sensitivity and resolving indeterminate results.

Purpose of the Study:

• To evaluate a microsphere immunoassay for quantifying antibodies to HCV core and NS3 antigens.
• To compare the sensitivity and performance of the microsphere assay against reference methods and enzyme immunoassays.
• To assess the utility of the microsphere assay in identifying antibodies during acute HCV infection and resolving indeterminate samples.

Main Methods:

• Quantification of antibodies to HCV core and NS3 using a microsphere immunoassay combined with flow cytometry.
• Comparison of antibody detection timing in acute HCV cases against reference methods.
• Analysis of indeterminate samples using the microsphere assay versus reference methods.
• Sensitivity comparison with a 5-fold increase noted against enzyme immunoassay.

Main Results:

• Elevated antibodies to HCV core and NS3 were detected in 85 seropositive blood donors.
• The microsphere assay detected antibodies earlier than reference methods in three acute HCV cases.
• Significant resolution of indeterminate samples was observed: 25% became negative and 30% positive.
• The assay demonstrated a 5-fold increase in sensitivity compared to enzyme immunoassay.

Conclusions:

• The microsphere immunoassay offers enhanced sensitivity for quantifying specific antibodies to HCV core and NS3.
• This assay is valuable for early detection of HCV infection, particularly in acute stages.
• The microsphere assay effectively resolves a substantial proportion of indeterminate samples, improving diagnostic accuracy.